Last stage safe flow monitoring and control system and method

Abstract

The invention belongs to the technical field of steam turbines, and in particular relates to a system and method for monitoring and controlling the final safety flow rate of a steam turbine. Cylinder exhaust pressure value, and according to the pressure value, set the allowable low-pressure cylinder inlet steam parameter and/or low-pressure cylinder extraction parameter value range, and the actual value of the low-pressure cylinder inlet steam parameter and/or low-pressure cylinder extraction parameter The measured values ​​are compared, and when the actual measured value exceeds the allowable value range, the steam intake of the low-pressure cylinder of the steam turbine is adjusted so that the actual measured value is within the allowable value range. The invention effectively solves the problem of monitoring, adjusting and controlling the minimum safe flow rate of the final stage of a large steam turbine, can ensure the safe and economical operation of the unit, and the system has the characteristics of simple structure, safety and reliability.

Description

technical field [0001] The invention belongs to the technical field of steam turbines, in particular to a system and method for monitoring and controlling the safety flow of the final stage of a steam turbine. Background technique [0002] Steam turbine is the main driving equipment of large rotary equipment, especially generators, and it is widely used in modern industry, especially in the field of power generation. With the increase of unit capacity of power generation equipment, the length of the final stage blade of the steam turbine gradually increases, and the longer final stage blade will induce flutter under the small volume flow rate, and eventually lead to fatigue fracture of the blade, which seriously threatens the safe operation of large steam turbines. [0003] Usually steam turbine manufacturers stipulate a minimum safe volumetric flow rate during the design process of long blades, and take measures to ensure that the actual flow rate of the final stage of the ...

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Problems solved by technology

In order to improve energy utilization efficiency and heating economy, realize energy saving, water saving and harmful gas emission reduction, the waste heat utilization of heating units has been developed rapidly in recent years, but limited by the water flow and return water parameters of the heating network, the current double back Compressed double-rotor technology, low-pressure cylinder optical shaft technology, and absorption heat pump technology can only recover the waste heat of one unit. How to minimize the waste heat of the steam turbine and improve the pow

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